3b-scientific Training Oscilloscope User Manual download pdf

3B SCIENTIFIC

PHYSICS

Demonstration oscilloscope U8481350

Instruction sheet

01/08 CW/ALF

Inputs:

1 Anode voltage

2 Cathode voltage

3 Wehnelt (focussing) voltage

4 Heater voltage (0)

5 Heater voltage (+)

6 Chassis ground

7 Deflecting plate (left)

8 Deflecting plate (right)

Outputs:

9 Saw-tooth generator (-)

10 Saw-tooth generator (+)

11 Deflecting coils

12 Circular magnet (obscured by

deflection coil)

13 Cathode ray tube

14 Metal ring

15 Coarse adjustment for saw-

tooth frequency

16 Fine adjustment saw-tooth

frequency

1. Safety instructions

The demonstration oscilloscope is operated with volt-

ages, some of which are above 60 V.

• Always turn off power supply before making con-

nections.

• Use safety leads.

Since the glass tube is evacuated, there is an implo-

sion hazard.

• Do not subject the tube to sharp blows or me-

chanical stress.

In schools and training institutions, operation of the

device is to be responsibly supervised by trained per-

sonnel.

2. Description

The demonstration oscilloscope can be used to show

the deflection of an electron beam by electric and

magnetic fields, just as employed in TVs or conven-

tional oscilloscopes. Essentially, it consists of a cath-

ode ray tube that is supplied with voltage via 4-mm

plugs and is surrounded by a ring, to which deflecting

coils can be attached.

A cathode ray tube is an evacuated glass tube, the

neck of which contains a heated cathode and an an-

ode in the shape of a disc with a hole in the middle,

separated by a distance of approximately half a cen-

timetre. Electrons emitted from the heated cathode

are accelerated towards the anode. Some of them

pass through the hole to form a beam that strikes the

fluorescent screen (with zinc silicate coating) and thus

becomes visible as a green fluorescent dot. The beam

is focussed partly by a Wehnelt cylinder surrounding

the cathode, the potential of which is negative with

1 2 3 4 5 6

3B SCIENTIFIC 1
PHYSICS 1

Summary of Contents

Page 1 - PHYSICS

3B SCIENTIFIC® PHYSICS 1 Demonstration oscilloscope U8481350 Instruction sheet 01/08 CW/ALF Inputs: 1 Anode voltage 2 Cathode voltage 3

Page 2

2 respect to the cathode potential, and partly by gas constriction as a result of the tube being filled with neon at a pressure of 0.01 mm Hg that als

Page 3

3 tions, a saw-tooth generator is used to supply this voltage. In this case, the beam goes from left to right and then quickly flicks back again. This

Page 4

4 • With the fine adjustment, search for a frequency at which a standing image appears, which shows a clear period of oscillation. At which other saw

Page 5

5 Fig.3 Magnetic deflection of the electron beam (left: with power supply U8521371 and power supply U33020, right: with power supply U33000)

Page 6

Elwe Didactic GmbH • Steinfelsstr. 6 • 08248 Klingenthal • Germany • www.elwedidactic.com 3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany

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3b-scientific Training Oscilloscope User Manual

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